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Definition: CHLOROPHYLL from A Dictionary of Entomology

Noun. (Greek, chloros = yellow + phyllon = leaf. PL, Chlorophylls.) Green colouring matter of plants and one substance found in blood of insects. Variants include: chlorophyll a (blue-green chlorophyll) and chlorophyll b (yellow-green chlorophyll).


Chlorophyll

From Encyclopedia of Environment and Society
CHLOROPHYLLS ARE A class of chemical pigments found in many types of plant life, and are necessary for the process of photosynthesis. Chlorophylls absorb light in particular parts of the electromagnetic spectrum, meaning that they have a very vivid green color, which is characteristic of their presence and encourages industrial applications as well as health promotion. Photosynthesis is the process by which sunlight is converted into chemical energy within plant cells through organic carbon compounds. It is possible that chlorophyll or a similar substance was a vital link in the evolution of life. The 1997 Pathfinder mission to mars found some evidence that substances similar to chlorophyll might be present in Martian soil. The five types of chlorophyll (a, b, c, d, and e) are found in the higher plants and different forms of algae; bacterio-chlorophyll is found in some types of bacteria. Chlorophylls consist of a magnesium atom surrounded by a porphyrin ring containing nitrogen and…
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Full text Article chlorophyll

From Hawley's Condensed Chemical Dictionary
The green pigment essential to photosynthesis. It is present in all plants except fungi and bacteria. It occurs in three forms (a, b, and c), all of which are magnesium-centered porphyrins containing a hydrophilic carbocyclic ring with a lipophilic phytyl tail. Chlorophyll is a photoreceptor for…
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Full text Article chlorophylls

From Dictionary of Microbiology & Molecular Biology
CHLOROPHYLLS: Chlorophyll a (phytyl = C20H39)....
A class of pigments involved in PHOTOSYNTHESIS ; they may be regarded as derivatives of protoporphyrin IX (see PORPHYRINS ) complexed with magnesium (see figure on page 158). (cf. PHAEOPHYTIN .) Chlorophylls in algae and cyanobacteria . Chlorophyll a (Chl a )—see figure—occurs in all organisms which…
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Full text Article CHLOROPHYLL

From Gaither's Dictionary of Scientific Quotations
American botanist, naturalist, and author For inert and inorganic elements – water and carbon dioxide of the air, the same that we breathe out as a waste – chlorophyll can synthesize with the energy of sunlight. Every day, every hour of all the ages, as each continent and, equally important, each…
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Full text Article chlorophyll

From Penguin Dictionary of Biology
Green pigment found in all algae and higher plants except a few saprotrophs and parasites. Responsible for light capture in PHOTOSYNTHESIS . Located in CHLOROPLASTS , except in CYANOBACTERIA (blue-green algae) where borne on numerous photosynthetic membranes (thylakoids) dispersed in the cytoplasm…
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Full text Article chlorophyll

From The Columbia Encyclopedia
(klôr'Әfĭl´´), green pigment that gives most plants their color and enables them to carry on the process of photosynthesis . Chemically, chlorophyll has several similar forms, each containing a complex ring structure and a long hydrocarbon tail. The molecular structure of the chlorophylls is similar…
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Full text Article chlorophyll

From Science Encyclopedia: Encyclopedia of Chemistry
chlorophyll
Also known as: bacteriochlorophyll Part of the photosynthetic systems in green plants. Generally speaking, it can be considered as a magnesium complex of a porphyrin in which a double bond in one of the pyrrole rings (17–18) has been reduced. A fused cyclopentanone ring is also present (positions…
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Full text Article chlorophyll

From The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide
Group of pigments including chlorophyll a and chlorophyll b, the green pigments present in chloroplasts in most plants; it is responsible for the absorption of light energy during photosynthesis . The pigment absorbs the red and blue-violet parts of sunlight but reflects the green, thus giving…
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Full text Article deep chlorophyll maximum (DCM)

From Science Encyclopedia: Encyclopedia of Marine Science
Under favorable conditions a deep chlorophyll maximum, or DCM, indicative of high productivity is located near the bottom of the euphotic zone (the zone in the upper ocean where sunlight is sufficient for photosynthesis). In order to sustain an actively growing phytoplankton community in a low light…
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Full text Article chlorophyll

From The Penguin Dictionary of Science
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Full text Article chlorophyll

From The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide
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